1756-HSC+++1756-HSC
1756-HSC+++1756-HSC1.幀中的BYTES表示需要讀取或者寫入的字節(jié)數(shù)。
2.地址算法上有說明。
3.累加和是從STX后面一個字節(jié)開始累加到ETX的和。
三菱FX系列PLC編程口通信源代碼fx_comm.h
注:位元件包括X,Y,M,S以及T,C的線圈等;
字元件包括D,T,C,KnX,KnY,KnM等。
三菱FX系列PLC專用協(xié)議通信指令格式詳解,約定說明:
ENQ為請求標(biāo)志,ascii 值5,VB中以chr(5)表示;
ACK為正確標(biāo)志,ascii 值6,VB中以chr(6)表示;
STX為請求標(biāo)志,ascii 值2,VB中以chr(2)表示;
EXT為請求標(biāo)志,ascii 值3,VB中以chr(3)表示;
表格中紅色字為需要求和效驗的部分;
和效驗為每一項的ascii 值的總和轉(zhuǎn)換成十六進制后區(qū)低兩位;
站號、PLC號、元件數(shù)量、和效驗都是以十六進制表示;
等待延時為0-150毫秒,以十六進制0H-FH表示,如100ms為AH。
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